JPS577692A - Prevention system for ineffective holding of trunk line - Google Patents

Prevention system for ineffective holding of trunk line

Info

Publication number
JPS577692A
JPS577692A JP8203080A JP8203080A JPS577692A JP S577692 A JPS577692 A JP S577692A JP 8203080 A JP8203080 A JP 8203080A JP 8203080 A JP8203080 A JP 8203080A JP S577692 A JPS577692 A JP S577692A
Authority
JP
Japan
Prior art keywords
trunk line
trunk
handset
extension
path
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8203080A
Other languages
English (en)
Inventor
Mamoru Sugawara
Mitsuo Ooshima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP8203080A priority Critical patent/JPS577692A/ja
Publication of JPS577692A publication Critical patent/JPS577692A/ja
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
JP8203080A 1980-06-17 1980-06-17 Prevention system for ineffective holding of trunk line Pending JPS577692A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8203080A JPS577692A (en) 1980-06-17 1980-06-17 Prevention system for ineffective holding of trunk line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8203080A JPS577692A (en) 1980-06-17 1980-06-17 Prevention system for ineffective holding of trunk line

Publications (1)

Publication Number Publication Date
JPS577692A true JPS577692A (en) 1982-01-14

Family

ID=13763123

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8203080A Pending JPS577692A (en) 1980-06-17 1980-06-17 Prevention system for ineffective holding of trunk line

Country Status (1)

Country Link
JP (1) JPS577692A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63161799A (ja) * 1986-12-24 1988-07-05 Matsushita Electric Ind Co Ltd ボタン電話装置
JPH0437244A (ja) * 1990-06-01 1992-02-07 Hitachi Ltd 局線トランク

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63161799A (ja) * 1986-12-24 1988-07-05 Matsushita Electric Ind Co Ltd ボタン電話装置
JPH0437244A (ja) * 1990-06-01 1992-02-07 Hitachi Ltd 局線トランク

Similar Documents

Publication Publication Date Title
US3557318A (en) Apartment house telephone system
JPS577692A (en) Prevention system for ineffective holding of trunk line
US3156775A (en) Telephone converter
JPS573491A (en) Incoming call restricting system
US3927278A (en) Direct-station-selection intercommunication and automatic holding circuit in a key telephone system
JPS57160254A (en) Connection control system
GB627766A (en) Improved carrier wave telephone system
JPS5613866A (en) Communication device
JPS56103564A (en) Paging transfer system
US2735898A (en) bartha
JPS56122293A (en) Trunk reservation system
JPS5563162A (en) Subscriber line call signal transmission system
JPS6417549A (en) Network control unit
JPS57131158A (en) Automatic answering telephone set
JPS5690667A (en) Automatic transfer system for incoming call
JPS5660153A (en) Calling system of branch connection telephone set
JPS5630352A (en) Subscriber's terminal equipment
JPS5586258A (en) B board paging system
JPS57147367A (en) Conference trunk
JPS56162565A (en) Connection system for standard telephone set with key telephone set
JPS5793766A (en) Call-out system
JPS5485609A (en) Direct telephone unit
JPS5460808A (en) Non-answer call-back service system
JPS54150906A (en) Informing system for calling subscriber telephone number
JPS57132496A (en) Night transfer set